James f



(No Model.)

J. F. HALL. PLUMB LEVBL.

No. 479,981. Pateglted Aug. 2, 1892. I 9 2 q n w a 5 ks; \bt '1 &

nventor:

JeaFA/ajj flags NITED- STATES PATENT JAMES F. HALL, OF KANSAS CITY,MISSOURI, ASSIGNOR OF ONE-FOURTH TO THOMAS B. BUOKNER, OF SAME PLACE.

PLUMB-LEVEL.

SPECIFICATION forming part of Letters Patent No. 479,981, dated August2, 1892.

Application filed August 18, 1891. Serial No. 403,018. (No model.)

T0 at whom it may concern:

Be it known that I, JAMES F. HALL, of Kansas City, in the county ofJackson and State of Missouri, have invented certain new and usefulImprovements in Levels, of which the following is a full, clear, andexact description, reference being had to the accompanying drawings,which form a part of this specification.

My invention relates to certain new and useful improvements inplumb-levels; and my invention consists in certain features of noveltyhereinafterdescribed, and pointed out in the claims.

Figure I is a perspective View of my improved device. Fig. II is anenlarged detail section showing various parts of myimprovement. Fig. IIIrepresents an enlarged detail section showing a gravity-disk foroperating the index finger. Fig. IV is an enlarged transverse sectionshowing the difierent parts of my device in position.

Referring to the drawings, 1 represents the stock of my improved level,which is preferably made in two parts, as shown in Fig. I, the two partsbeing glued together after the indicating portion of the level is placedin position; but I do not confine myself to such construction, as theindicating parts may be otherwise secured or placed in connection withthe stock. At the center of the stock I form a pocket 2 for the locationof the parts for operating the index-finger, said pocket being connectedwith an opening 3, extending to the outside of the stock, said openingand pocket being preferably made semicircular in form.

4 represents a disk secured byascreW-shaft 5 to the stock 1, as shown at6, said disk 4 being rigidly secured to said shaft 5. The disk 4 isprovided on its periphery with circular grooves 7, in which rest endlesscords 8, said cords extending around and supporting the gravity-disk 9,provided with grooves 10, in which said cords rest, thus permitting thedisk 9 to move either right or left in a circular direction, alwaysremaining the same distance from the disk 4, and permitting the saiddisk 9 to rotate on the cords 8, thus reducing the friction to aminimum. The gravity-disk 9 is provided with a central extension 11.

12 represents a link or arm pivoted to the shaft 5 of the disk 4, asshown at 13, said link 12 having its lower end slotted, as shown at 14,said slot passing over the extension 11 on the disk 9 and having awasher 15, secured to said extension outside of the link 12, to preventit from passing out of engagement with this said extension. It will thusbe seen that as the disk 9 moves to the right or left it will cause thelink 12 to move on its pivot 13.

16 represents a dial-face, preferably semicircular in form, saiddial-face being also pivoted, as shown at 13, to the shaft 5 of the disk4, the upper end of the link 12 being bent at right angles, as shown at17, and passing through a semicircular opening 18 in the dialface 16. l

19 represents an index-finger secured to said extension, as shown at 20.

21 represents a scale divided into feet and fractions thereof, (see Fig.IL) said index-fingerthus indicating whether or not the surface on whichthe stock is placed is level, and, if out of level, indicatingin feetand inches how much it is out of level. The dotted lines in Fig. II willshow that as the stock is tilted out of a horizontal plane thegravity-weight 9, always remaining plumb, will move the indi- 8o cator,showing the amount of feet and inches that the matter is out of level;or, in other words, the index-finger always remaining in a perpendicularposition and the dial moving to the right or left will show thevariance.

The dial-face 16 is provided with a thread or notches 22 on an extension23 thereof, said notches engaging with a screw 24, secured to the stock1 by a plate 25. (See Fig. II.) By this means the dial-face can beadjusted, if found necessary to do so. V

26 represents a glass face, which may be secured to the stock 1 over theopening 3 to close said opening and to permit ready observation of theindex-finger and scale.

I claim as my invention 1. The combination of the stock, the upper disksecured to the stock, the lower disk suspended from the upper disk, thedial-plate having a slot, and the link supported on the too shaft,connected with the lower disk, and having an index-finger projectingthrough the slot, substantially as described.

2. The combination of the stock, the upper grooved disk, the lowergrooved disk having an extension, the cords by which the lower disk issuspended from the upper disk, the dial-plate having a slot, and thelink supported on the shaft, having a slot by which it is connected tothe extension of the lower disk, and provided with an index-finger projecting through the slot of the dial-plate, sub stantially as described.

3. The combination of the stock 1, disk 4, secured rigidly to saidstock, a movable disk in connection with said stationary disk, a linkconnecting said disks, an index-finger secu red to said link, and asuitable scale secured to said SiJOOlQSllbStitlltlEtll) as described,and for the purpose set forth.

4:. lhe combination of the stock 1, stationary disk 4, having itsperiphery grooved, a movable disk 9, having its periphery grooved, aflexible support resting in said grooves and supporting disk 9, a linkconnecting said disks, an index-finger 011 said link, and a scalesecured to said stock, substantially as described, and for the purposeset forth.

5. The combination of the stock 1, pivoted link 12, having its lower endweighted, an indeX-finger 19 on the upper end of said link, a dial-face16, having an opening 18, and a scale 21, said dial-face being providedwith grooves 22, with which a screw 24: engages for adj usting the same,substantially as described, and for the purpose set forth.

JAMES F. HALL.

\Vitnesses:

TD. OKEEFE, JAS. E. KNIGHT.

